FlexStat 9 Operation Guide, Rev. R
reverting from Standby back to Occupied
mode (although it may still take some
time for the room to reach its normal
temperature). See (Advanced) CO2 Sensor
(and DCV) on page 11.
NOTE: DCV is only available in models with the
built-in CO
2
sensor.
The State eld monitors whether motion has been
detected during the last scan of the motion sensor
input (BI6). Detected motion will show an “occu-
pied” state. This can be used during troubleshooting
to determine if motion is being detected.
Optimum Start Setup
OPTIMUM START
OPT START:
DISABLE
When Optimum Start is enabled, the FlexStat soon
“learns” the amount of time required to reach
the setpoint from the setback/setup temperature.
It will then adjust the actual start time needed
to reach the desired setpoint at the beginning
of the scheduled On times. (See the chart in the
(Advanced) Motion Sensor section.) It will also make
seasonal temperature adjustments if an outside air
temperature sensor is connected appropriately.
NOTE: For maximum eciency, if Optimum
Start is enabled, set times in schedules for
when the room temperature should reach
the setpoint, not when heating/cooling
equipment should start (which would be
earlier). See Schedules on page 24.
NOTE: For details of the energy-saving calculations
performed, see the Optimum Start section
in the relevant Sequence of Operation in the
FlexStatApplicationGuide.
Sensor Setup
SENSOR SETUP
IN 2:
IN 9: CO2
SPACE TEMP: REMOTE
-- IN 1 IS ONBOARD
-- IN 7 IS REMOTE
DISCH AIR TEMP
Input 7 (AI7) can be congured for a remotespace
temperaturesensor. Then space temperature can be
congured for onboard (internal AI1), remote (AI7),
averaging of the two, the lowest reading, or the high-
est reading. To calibrate and change the thermistor
type, see (Advanced) Inputs on page 17.
Input 2 (AI2) can be congured for dischargeair
temperature (DAT and Type III thermistor is the
default), fanstatus (dry contact), or unused.
• If AI2 is set for dischargeairtemperature, a
trend log is automatically created and monitors
the discharge air temperature, but it has no eect
on operation. The sensor can be calibrated and
changed from the default Type III thermistor to a
Type II. See (Advanced) Inputs on page 17.
• If AI2 is set for fanstatus and no closed contact is
detected when there is a call for fan operation, a
Fan Fail Alarm is created. See Alarms on page 23.
• If AI2 is set for unused, built-in applications will
not use it, but the input would be available for
custom programming.
In BAC-12xxxx/13xxxx/14xxxx models, Input 9 (AI9)
can be congured for an external KMC SAE-10xx
CO
2
sensor. For more information, see DCV (Demand
Control Ventilation) Setup on page 11.
See also Motion Sensor Setup on page 8.
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